# #dependency-injection

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Page: https://videotomd.com/t/dependency-injection/
Briefs: 3

- [Test verification ladders without network calls](https://videotomd.com/b/text-local-test-verification-ladders-with-injected-lookups-f809f7bcf6ae/index.md): Inject one lookup seam to exercise source agreement, fallback, errors, and freshness boundaries deterministically.
- [Test Geographic Coverage Invariants](https://videotomd.com/b/text-local-test-geographic-coverage-invariants-6282f5a90929/index.md): Separate stable synthetic grain tests from a live-data smoke test that respects the service footprint.
- [Isolate Dataset Load and Parse Failures](https://videotomd.com/b/text-local-isolate-dataset-load-failures-6282f5a90929/index.md): Keep missing or malformed datasets from aborting an otherwise usable multi-dataset response.